The biggest difference to overcome is that the '66 regular cluster uses a plastic wire loom with fold in bulb holders. '66 rally cluster has metal bulb holders that push in to the speedo housing and no wire loom. Some of the other wiring is different as well. Too complicated to re-type. Better to look at the threads with Pics.
If you have a rally harness that is ac or non ac, matching your ac/non ac car, then you will want to use that. '65 should be same as well.
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"If you do everything you'll win"
-LBJ
13 Smiles per Gallon:
66 Bonneville wagon
66 Bonneville 2d HT - In perpetual progress
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